Well, when god invented electricity for refrigerators, it helped cut down on food poisoning from spoiled meat. But the smoke from the power plants causes some illnesses, including cancer. It's a tradeoff, and it's called "progress". We still enjoy the electricity, and we continue to make progress to eliminate the smog. One way to do that is nuclear, which overall is much cleaner, but it has the issue of fuel disposal. More progress.
There will be some missteps. Polybutylene was a misstep. There will be others. More progress.
PEX is no longer what you would call "new". We will find out soon enough if there are any chemical leaching problems. A high quality carbon-based filter rated for lead and VOC's used on your drinking water will take away those worries. And if you are talking bottled water, dont even go there. Recent reports in the news indicate that much of it is bottled right out of municipal supplies. Maybe a little filtering, a few mineral added for flavor.
Is PEX just slightly easier to damage if you poke it with a nail....yes. We will just have to get used to that, like we got used to wearing seatbelts. More progress.
Take vaccines. Literally hundreds of millions of people are live today, or at least lived to a ripe old age, due to NOT dying of polio, smallpox, etc.etc. Very occasionally, does a person get ill or even die because their genes were adverse to the vaccine? Yes. More progress. Your choice.
Sorry, it isn't Sunday, so I shouldn't be preaching!
If I were in your shoes, I would evaluate cost differences, the cost of filtering if I thought that was important, and the cost and ease of installation, and make a decision accordingly. I try to avoid sensationialistic , non-scientific reports on these issues.